I need to form list of Contact headers with "q" parameters for "302 Moved Temporary".

I do something like this:

...

# $xavp(contacts) - contains list of contact URIs (uri) and Q values (q)

$var(i) = 0;

$var(num) = $cnt($xavp(contacts));

while($var(i) < $var(num)) {

    if($var(i) == 0) {

        # How to add q value to this branch?

        $ru = $xavp(contacts[$var(i)]=>uri);

    } else {

        append_branch("$xavp(contacts[$var(i)]=>uri)", "$xavp(contacts[$var(i)]=>q)");

    }

}

...

Is it possible to set "q" value for the main branch?

For additional branches I do it via append_branch("uri", q_value) but I didn't find any way to do it for the main branch pointed via $ru/$du. The pseudo-variable "$branch" also doesn't allow me to access the main branch.

Thanks,

Maxim